Re: Long string ...

[Andrew Johnson <anj@aps.anl.gov>]

On Monday 27 September 2010 14:17:55 emmanuel_mayssat@lynceantech.com wrote:
>
> That doesn't seem to work either (at least with a stringout record)

You need to use the -S option to get the caget/caput/camonitor tools to handle 
an array of chars as a long string.

All the '$' field modifier does on a string or link field is to change the 
native field type that the CA server reports for that channel into an array of 
chars.  Your CA clients have to be coded with a configuration switch to turn 
on the handling of such char arrays as a long string; MEDM and EDM have been 
able to do this in their text widgets for many years (you do have to configure 
the widgets properly though).  The catools programs use that -S switch.

If you maintain your own CA client program, do *not* try to recognize the '$' 
field modifier and make that the behaviour switch, as they wouldn't be able  
to store/read text in a waveform record.

- Andrew
-- 
The best FOSS code is written to be read by other humans -- Harald Welte